1910.] NATURAL SCIENCES OF PHILADELPHIA. 355 



elongated subulate with filamentous ends, without subterminal 

 enlargement and bearing filamentous sensory cilia with rounded ends 

 and as long as one-half diameter of style ; the dorsal twice, the ventral 

 one and three-fifth times length of prostomium. Metastomial seg- 

 ments separated by only obscure furrows; the dorsum little convex 

 and with scarcely noticeable transverse ridges ; elytrophores and dorsal 

 tubercles both low and inconspicuous. Venter very smooth; neural 

 furrow and lateral muscular ridges little developed except toward 

 caudal end. Xephridial papillae begin at VI, arising from well-marked, 

 rounded swellings at posterior base of parapodia, all small and directed 

 dorsad into interpodal clefts. Pygidium minute with dorsal anus 

 directed dorso-caudad and surrounded by a finely crenulated border. 

 Anal cirri missing from all specimens but judging from the size of 

 their scars of large size. 



Parapodia (PI. XXX, fig. 31) short, less than one-half width of 

 segments at anterior end and middle of type, longer toward caudal 

 end and throughout the length of some specimens but never prominent, 

 compressed, fully as deep as long, dorsal slope very steep, rami well 

 differentiated, not greatly unequal in size. Xeuropodium rather 

 slender, divided distally into a short, broad, truncate postsetal lobe 

 and a much longer, slender, compressed presetal lobe tapering to a 

 blunt end and 'including the acicular process which terminates in a 

 slender cirrus about two-thirds as long as the process. Xotopodium 

 relatively large, nearly as broad as setigerous portion of neuropodium 

 which it overlaps broadly from behind, bearing a long, slender, tapered 

 blunt, acicular process lacking a cirrus and reaching nearly to the 

 end of the neuropodial acicular process without its cirrus. Some 

 specimens have the parapodia studded with small spherical bodies 

 filled with a mass resembling spores which project from the surface 

 and which are probably parasitic in nature. 



Notocirrophores (Pi. XXX, fig. 31) situated closeto thenotopodia and 

 partly concealed behind their seta?, subcorneal with swollen base reach- 

 ing tip of notopodial acicular process; styles long and slender like 

 tentacular cirri, regularly tapered without subterminal enlargement, 

 bearing sparsely distributed slender cilia with globoid ends, many 

 of them as long as diameter of style, reaching about two-fifths of 

 length beyond tips of longest neuropodial seta? and to elytrophores of 

 opposite side. Neurocirri (fig. 31) arising behind middle of ventral 

 face of parapodia by a small cirrophore; styles subulate, slender, 

 reaching to base of acicular process or beyond, entirely lacking sensory 

 cilia or with a very few minute ovate ones. Xeurocirrus of II more than 

 twice length of others. 



